mozilla/pdf.js — pull request #2773 by Snuffleupagus (2013-02-22 00:47:19+00:00)
Title: Makes navigation keys work on document load

This PR sets focus to the viewerContainer, which makes all navigation keys work on document load.
Fixes [bug 843653](https://bugzilla.mozilla.org/show_bug.cgi?id=843653)